了解查找模式的功能

Question

希望这是一个可以在这里问的问题... 所以我得到了一些帮助来创建一个函数来查找模式（在数组中出现次数最多的数字）。但现在我需要一点帮助来理解它...... （我是编程新手） 数据是保存“信息”，在另一个文件中包含多个数组。

let mode = function(data) {
  data.sort(function(a, b) {
    return a - b;    
  });
  let mode = {},
  highestOccurrence = 0,
  modes = [];
  data.forEach(function(element) {
    if (mode[element] === undefined) {
      mode[element] = 1;
    } else {
      mode[element]++;
    }
    if (mode[element] > highestOccurrence) {
      modes = [element];
      highestOccurrence = mode[element];
    } else if (mode[element] === highestOccurrence) {
      modes.push(element);
      highestOccurrence = mode[element];
    }
  });
  return modes;
};

所以一开始我只是对函数进行排序，这样数字就会以正确的顺序出现。但是有人可以帮我理解其余的功能吗？

Answer 1

我添加了一些 cmets，我只能推断出您提供的代码。您可以为您的问题提供更多背景信息，例如您拥有什么样的数据以及您想要实现什么目标，并可能提供有用的示例。

let mode = function(data) {
  data.sort(function(a, b) {
    return a - b;    
  });
  let mode = {},
  highestOccurrence = 0,
  modes = [];

  // This loops through data array (It should be data here and not data1)
  data.forEach(function(element) {

    // Here you check if the mode object already have that element key,  
    // setting the first occurence or incrementing it

    if (mode[element] === undefined) {
      mode[element] = 1;
    } else {
      mode[element]++;
    }

    // After that it checks if that mode has the higher occurence

    if (mode[element] > highestOccurrence) {

      // If it has the higher occurence it sets the modes to an array with
      // that element and the highestOccurrence value to that value
      modes = [element];
      highestOccurrence = mode[element];

    } else if (mode[element] === highestOccurrence) {
      // If it has the same number of occurences it just adds that mode to
      // the modes to be returned
      modes.push(element);
      highestOccurrence = mode[element];
    }
  });
  return modes;
};

希望对你有帮助